The infection rate of ascarids in pupils at test villages decreased by 12.71% and 33.61% before long and half a year after deworming and decreased by 41.16% and 55.09% in three, ten years after improving drinking water and lavatories.

  • 小学生蛔虫感染率,试验村与对照村驱虫前和驱虫后半年相比较,改水改厕第3、10年分别低12.71%和33.61%、41.16%和55.09%。

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